| 摘要 |
<p>A transformer-isolated analog-to-digital converter (ADC) feedback apparatus and method provides reduction of circuit complexity in high power/high voltage systems having a transformer-isolated sensing circuit. The feedback apparatus is a circuit including an ADC (41) for receiving an analog input signal (Vin) and a transformer (T3) having a first winding that receives a modulated output of the analog- to-digital converter. A second winding of the transformer provides an isolated data output of the ADC. A demodulator (31, 32) is coupled to the second winding of the transformer and.demodulates the isolated output to generate a digital representation (ADC out) of the analog input signal. The ADC may be a delta-sigma converter and the demodulator may be the corresponding decimation filter (32). The circuit further includes an isolation circuit (34, 35) for introducing a clock signal and/or power supply waveform at the second winding of the transformer, so that the ADC circuit is supplied with an isolated clock and/or an isolated power supply.</p> |
